Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f8b77d39 | 2 | #include <linux/delay.h> |
bff61975 N |
3 | #include <linux/raid/md_u.h> |
4 | #include <linux/raid/md_p.h> | |
1da177e4 LT |
5 | |
6 | #include "do_mounts.h" | |
7 | ||
8 | /* | |
9 | * When md (and any require personalities) are compiled into the kernel | |
10 | * (not a module), arrays can be assembles are boot time using with AUTODETECT | |
11 | * where specially marked partitions are registered with md_autodetect_dev(), | |
12 | * and with MD_BOOT where devices to be collected are given on the boot line | |
13 | * with md=..... | |
14 | * The code for that is here. | |
15 | */ | |
16 | ||
a364092a AV |
17 | #ifdef CONFIG_MD_AUTODETECT |
18 | static int __initdata raid_noautodetect; | |
19 | #else | |
20 | static int __initdata raid_noautodetect=1; | |
21 | #endif | |
22 | static int __initdata raid_autopart; | |
1da177e4 LT |
23 | |
24 | static struct { | |
25 | int minor; | |
26 | int partitioned; | |
2604b703 | 27 | int level; |
1da177e4 LT |
28 | int chunk; |
29 | char *device_names; | |
e8703fe1 | 30 | } md_setup_args[256] __initdata; |
1da177e4 LT |
31 | |
32 | static int md_setup_ents __initdata; | |
33 | ||
1da177e4 LT |
34 | /* |
35 | * Parse the command-line parameters given our kernel, but do not | |
36 | * actually try to invoke the MD device now; that is handled by | |
37 | * md_setup_drive after the low-level disk drivers have initialised. | |
38 | * | |
39 | * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which | |
40 | * assigns the task of parsing integer arguments to the | |
41 | * invoked program now). Added ability to initialise all | |
42 | * the MD devices (by specifying multiple "md=" lines) | |
43 | * instead of just one. -- KTK | |
44 | * 18May2000: Added support for persistent-superblock arrays: | |
45 | * md=n,0,factor,fault,device-list uses RAID0 for device n | |
46 | * md=n,-1,factor,fault,device-list uses LINEAR for device n | |
47 | * md=n,device-list reads a RAID superblock from the devices | |
48 | * elements in device-list are read by name_to_kdev_t so can be | |
49 | * a hex number or something like /dev/hda1 /dev/sdb | |
50 | * 2001-06-03: Dave Cinege <dcinege@psychosis.com> | |
51 | * Shifted name_to_kdev_t() and related operations to md_set_drive() | |
52 | * for later execution. Rewrote section to make devfs compatible. | |
53 | */ | |
54 | static int __init md_setup(char *str) | |
55 | { | |
2604b703 | 56 | int minor, level, factor, fault, partitioned = 0; |
1da177e4 LT |
57 | char *pername = ""; |
58 | char *str1; | |
59 | int ent; | |
60 | ||
61 | if (*str == 'd') { | |
62 | partitioned = 1; | |
63 | str++; | |
64 | } | |
65 | if (get_option(&str, &minor) != 2) { /* MD Number */ | |
66 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); | |
67 | return 0; | |
68 | } | |
69 | str1 = str; | |
1da177e4 LT |
70 | for (ent=0 ; ent< md_setup_ents ; ent++) |
71 | if (md_setup_args[ent].minor == minor && | |
72 | md_setup_args[ent].partitioned == partitioned) { | |
73 | printk(KERN_WARNING "md: md=%s%d, Specified more than once. " | |
74 | "Replacing previous definition.\n", partitioned?"d":"", minor); | |
75 | break; | |
76 | } | |
e8703fe1 | 77 | if (ent >= ARRAY_SIZE(md_setup_args)) { |
1da177e4 LT |
78 | printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor); |
79 | return 0; | |
80 | } | |
81 | if (ent >= md_setup_ents) | |
82 | md_setup_ents++; | |
2604b703 | 83 | switch (get_option(&str, &level)) { /* RAID level */ |
1da177e4 LT |
84 | case 2: /* could be 0 or -1.. */ |
85 | if (level == 0 || level == LEVEL_LINEAR) { | |
86 | if (get_option(&str, &factor) != 2 || /* Chunk Size */ | |
87 | get_option(&str, &fault) != 2) { | |
88 | printk(KERN_WARNING "md: Too few arguments supplied to md=.\n"); | |
89 | return 0; | |
90 | } | |
2604b703 | 91 | md_setup_args[ent].level = level; |
1da177e4 | 92 | md_setup_args[ent].chunk = 1 << (factor+12); |
2604b703 | 93 | if (level == LEVEL_LINEAR) |
1da177e4 | 94 | pername = "linear"; |
2604b703 | 95 | else |
1da177e4 | 96 | pername = "raid0"; |
1da177e4 LT |
97 | break; |
98 | } | |
99 | /* FALL THROUGH */ | |
100 | case 1: /* the first device is numeric */ | |
101 | str = str1; | |
102 | /* FALL THROUGH */ | |
103 | case 0: | |
2604b703 | 104 | md_setup_args[ent].level = LEVEL_NONE; |
1da177e4 LT |
105 | pername="super-block"; |
106 | } | |
107 | ||
108 | printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n", | |
109 | minor, pername, str); | |
110 | md_setup_args[ent].device_names = str; | |
111 | md_setup_args[ent].partitioned = partitioned; | |
112 | md_setup_args[ent].minor = minor; | |
113 | ||
114 | return 1; | |
115 | } | |
116 | ||
1da177e4 LT |
117 | static void __init md_setup_drive(void) |
118 | { | |
119 | int minor, i, ent, partitioned; | |
120 | dev_t dev; | |
121 | dev_t devices[MD_SB_DISKS+1]; | |
122 | ||
123 | for (ent = 0; ent < md_setup_ents ; ent++) { | |
124 | int fd; | |
125 | int err = 0; | |
126 | char *devname; | |
127 | mdu_disk_info_t dinfo; | |
bdaf8529 | 128 | char name[16]; |
1da177e4 LT |
129 | |
130 | minor = md_setup_args[ent].minor; | |
131 | partitioned = md_setup_args[ent].partitioned; | |
132 | devname = md_setup_args[ent].device_names; | |
133 | ||
134 | sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor); | |
1da177e4 LT |
135 | if (partitioned) |
136 | dev = MKDEV(mdp_major, minor << MdpMinorShift); | |
137 | else | |
138 | dev = MKDEV(MD_MAJOR, minor); | |
bdaf8529 | 139 | create_dev(name, dev); |
d613c3e2 | 140 | for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) { |
1da177e4 LT |
141 | char *p; |
142 | char comp_name[64]; | |
143 | u32 rdev; | |
144 | ||
145 | p = strchr(devname, ','); | |
146 | if (p) | |
147 | *p++ = 0; | |
148 | ||
149 | dev = name_to_dev_t(devname); | |
150 | if (strncmp(devname, "/dev/", 5) == 0) | |
151 | devname += 5; | |
152 | snprintf(comp_name, 63, "/dev/%s", devname); | |
153 | rdev = bstat(comp_name); | |
154 | if (rdev) | |
155 | dev = new_decode_dev(rdev); | |
156 | if (!dev) { | |
157 | printk(KERN_WARNING "md: Unknown device name: %s\n", devname); | |
158 | break; | |
159 | } | |
160 | ||
161 | devices[i] = dev; | |
162 | ||
163 | devname = p; | |
164 | } | |
165 | devices[i] = 0; | |
166 | ||
167 | if (!i) | |
168 | continue; | |
169 | ||
170 | printk(KERN_INFO "md: Loading md%s%d: %s\n", | |
171 | partitioned ? "_d" : "", minor, | |
172 | md_setup_args[ent].device_names); | |
173 | ||
bae217ea | 174 | fd = ksys_open(name, 0, 0); |
1da177e4 LT |
175 | if (fd < 0) { |
176 | printk(KERN_ERR "md: open failed - cannot start " | |
177 | "array %s\n", name); | |
178 | continue; | |
179 | } | |
cbb60b92 | 180 | if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) { |
1da177e4 LT |
181 | printk(KERN_WARNING |
182 | "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n", | |
183 | minor); | |
2ca2a09d | 184 | ksys_close(fd); |
1da177e4 LT |
185 | continue; |
186 | } | |
187 | ||
2604b703 | 188 | if (md_setup_args[ent].level != LEVEL_NONE) { |
1da177e4 LT |
189 | /* non-persistent */ |
190 | mdu_array_info_t ainfo; | |
2604b703 | 191 | ainfo.level = md_setup_args[ent].level; |
1da177e4 LT |
192 | ainfo.size = 0; |
193 | ainfo.nr_disks =0; | |
194 | ainfo.raid_disks =0; | |
195 | while (devices[ainfo.raid_disks]) | |
196 | ainfo.raid_disks++; | |
197 | ainfo.md_minor =minor; | |
198 | ainfo.not_persistent = 1; | |
199 | ||
200 | ainfo.state = (1 << MD_SB_CLEAN); | |
201 | ainfo.layout = 0; | |
202 | ainfo.chunk_size = md_setup_args[ent].chunk; | |
cbb60b92 | 203 | err = ksys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo); |
1da177e4 LT |
204 | for (i = 0; !err && i <= MD_SB_DISKS; i++) { |
205 | dev = devices[i]; | |
206 | if (!dev) | |
207 | break; | |
208 | dinfo.number = i; | |
209 | dinfo.raid_disk = i; | |
210 | dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC); | |
211 | dinfo.major = MAJOR(dev); | |
212 | dinfo.minor = MINOR(dev); | |
cbb60b92 DB |
213 | err = ksys_ioctl(fd, ADD_NEW_DISK, |
214 | (long)&dinfo); | |
1da177e4 LT |
215 | } |
216 | } else { | |
217 | /* persistent */ | |
218 | for (i = 0; i <= MD_SB_DISKS; i++) { | |
219 | dev = devices[i]; | |
220 | if (!dev) | |
221 | break; | |
222 | dinfo.major = MAJOR(dev); | |
223 | dinfo.minor = MINOR(dev); | |
cbb60b92 | 224 | ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo); |
1da177e4 LT |
225 | } |
226 | } | |
227 | if (!err) | |
cbb60b92 | 228 | err = ksys_ioctl(fd, RUN_ARRAY, 0); |
1da177e4 LT |
229 | if (err) |
230 | printk(KERN_WARNING "md: starting md%d failed\n", minor); | |
231 | else { | |
232 | /* reread the partition table. | |
233 | * I (neilb) and not sure why this is needed, but I cannot | |
234 | * boot a kernel with devfs compiled in from partitioned md | |
235 | * array without it | |
236 | */ | |
2ca2a09d | 237 | ksys_close(fd); |
bae217ea | 238 | fd = ksys_open(name, 0, 0); |
cbb60b92 | 239 | ksys_ioctl(fd, BLKRRPART, 0); |
1da177e4 | 240 | } |
2ca2a09d | 241 | ksys_close(fd); |
1da177e4 LT |
242 | } |
243 | } | |
244 | ||
245 | static int __init raid_setup(char *str) | |
246 | { | |
247 | int len, pos; | |
248 | ||
249 | len = strlen(str) + 1; | |
250 | pos = 0; | |
251 | ||
252 | while (pos < len) { | |
253 | char *comma = strchr(str+pos, ','); | |
254 | int wlen; | |
255 | if (comma) | |
256 | wlen = (comma-str)-pos; | |
257 | else wlen = (len-1)-pos; | |
258 | ||
259 | if (!strncmp(str, "noautodetect", wlen)) | |
260 | raid_noautodetect = 1; | |
a364092a AV |
261 | if (!strncmp(str, "autodetect", wlen)) |
262 | raid_noautodetect = 0; | |
1da177e4 LT |
263 | if (strncmp(str, "partitionable", wlen)==0) |
264 | raid_autopart = 1; | |
265 | if (strncmp(str, "part", wlen)==0) | |
266 | raid_autopart = 1; | |
267 | pos += wlen+1; | |
268 | } | |
269 | return 1; | |
270 | } | |
271 | ||
272 | __setup("raid=", raid_setup); | |
273 | __setup("md=", md_setup); | |
274 | ||
ff083c83 | 275 | static void __init autodetect_raid(void) |
82cbc11a IM |
276 | { |
277 | int fd; | |
278 | ||
279 | /* | |
280 | * Since we don't want to detect and use half a raid array, we need to | |
281 | * wait for the known devices to complete their probing | |
282 | */ | |
283 | printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n"); | |
284 | printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n"); | |
216773a7 AV |
285 | |
286 | wait_for_device_probe(); | |
287 | ||
bae217ea | 288 | fd = ksys_open("/dev/md0", 0, 0); |
82cbc11a | 289 | if (fd >= 0) { |
cbb60b92 | 290 | ksys_ioctl(fd, RAID_AUTORUN, raid_autopart); |
2ca2a09d | 291 | ksys_close(fd); |
82cbc11a IM |
292 | } |
293 | } | |
294 | ||
1da177e4 LT |
295 | void __init md_run_setup(void) |
296 | { | |
bdaf8529 | 297 | create_dev("/dev/md0", MKDEV(MD_MAJOR, 0)); |
589f800b | 298 | |
1da177e4 | 299 | if (raid_noautodetect) |
a364092a | 300 | printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n"); |
82cbc11a IM |
301 | else |
302 | autodetect_raid(); | |
1da177e4 LT |
303 | md_setup_drive(); |
304 | } |